CN203502479U - Shielding layer carrier communication-based power cable ground wire current on-line monitoring system - Google Patents
Shielding layer carrier communication-based power cable ground wire current on-line monitoring system Download PDFInfo
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- CN203502479U CN203502479U CN201320658028.5U CN201320658028U CN203502479U CN 203502479 U CN203502479 U CN 203502479U CN 201320658028 U CN201320658028 U CN 201320658028U CN 203502479 U CN203502479 U CN 203502479U
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Abstract
The utility model relates to a shielding layer carrier communication-based power cable ground wire current on-line monitoring system. The on-line monitoring system is characterized in that the system comprises a current transformer, a first inductive coupler, and a second inductive coupler. The current transformer collects a capacitive current of a detected near-end cable ground wire; a current conditioning circuit sends the current to a lower computer for current effective value extraction. The lower computer is connected with an LCD display module and a first carrier module; the first carrier module is connected with the detected near-end cable by a first high-level cable and a first inductive coupler; a second inductive coupler extracts a single at the tail end of the power cable and is connected with an upper computer successively by a second high-frequency cable, a second carrier module, and a serial port circuit. The provided on-line monitoring system with advantages of simple and convenient wiring, low equipment cost, accurate signal transmission, and good monitoring effect is suitable for signal transmission of an urban underground power grid.
Description
Technical field
The utility model relates to power-line carrier communication, particularly a kind of on-line monitoring system of the power cable ground line current based on screen layer carrier communication.
Background technology
Power line carrier communication utilizes transmission line of electricity as carrier communication medium, and the material and the construction cost that do not produce on passage drop into, and are a kind of communication modes most characteristic in electric system; And distribution network line is firm in structure, carrier terminal equipment is gone through multinomial technical renovation for adapting to circuit environment at modulation /demodulation, encoding and decoding, the technical elements such as anti-interference, makes power line carrier communication just really become a kind of i.e. economic convenient, safe and reliable power distribution automation communication mode again.But in electric system, power line carrier communication is because tunnel condition is poor, decay is large, and impedance variation is large, and the reason such as bursty interference is strong, makes carrier communication be difficult to open or unstable.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of on-line monitoring system of the power cable ground line current based on screen layer carrier communication.
The present invention adopts following scheme to realize: a kind of on-line monitoring system of the power cable ground line current based on screen layer carrier communication, is characterized in that: comprise a current transformer, the first inductive coupler and the second inductive coupler; This current transformer gathers tested near-end cable grounding line capacitance electric current and gives a slave computer extraction current effective value through a current regulating circuit; Described slave computer is connected with LCD display module and first carrier module; Described first carrier module is connected with described tested near-end cable through the first high flat cable, the first inductive coupler; The signal that described the second inductive coupler extracts power cable end is connected with a host computer through the second high frequency cable, the second carrier module and serial port circuit successively.
In the utility model one embodiment, the model of described current transformer is HCT215.
In the utility model one embodiment, described current regulating circuit comprises the active Butterworth LPF circuit of quadravalence and the absolute value circuit connecting successively.
In the utility model one embodiment, first and second described power carrier module is BWP09 power carrier module.
The utility model wiring is simple and convenient, and equipment cost is cheap, and accurately, monitoring effect is good in signal transmission, is applicable to the underground electric power networks signal transmission in cities and towns.Native system is not only applicable to power cable on-line monitoring, also, applicable to the occasions such as communication such as the transmission of urban power distribution network automated information, the early stage subsea cable without composite fiber, therefore has wide application space.
Accompanying drawing explanation
Fig. 1 is the utility model hardware structure principle schematic.
Fig. 2 is the utility model low-pass filter circuit schematic diagram.
Fig. 3 is the utility model absolute value circuit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1,2 and 3, the present embodiment provides a kind of on-line monitoring system of the power cable ground line current based on screen layer carrier communication, it is characterized in that: comprise a current transformer, the first inductive coupler and the second inductive coupler; This current transformer gathers tested near-end cable grounding line capacitance electric current and gives a slave computer extraction current effective value through a current regulating circuit; Described slave computer is connected with LCD display module and first carrier module; Described first carrier module is connected with described tested near-end cable through the first high flat cable, the first inductive coupler; The signal that described the second inductive coupler extracts power cable end is connected with a host computer through the second high frequency cable, the second carrier module and serial port circuit successively.
Concrete, at power cable head end, utilize current transformer HCT215 to gather cable grounding line capacitance electric current, after signal conditioning circuit, utilize slave computer PIC16F877A programming to extract current effective value, and show constantly by 1602 liquid crystal terrains, then by asynchronous serial communication mode, signal is passed to power line carrier, PLC module BWP09, and signal, after modulation, utilizes inductive coupler SL-Y2 to couple a signal to power cable metal screen layer.
At power cable end, utilize inductive coupler SL-Y2 by signal extraction out and be transferred to power line carrier, PLC module BWP09, after module demodulation, utilize serial ports and host computer to communicate, finally at host computer, utilize LabVIEW to make monitoring picture, the data that receive are shown by human-computer interaction interface, thereby complete the carrier-wave transmission of current signal and remote monitoring.
In the present embodiment, the effect of current transformer circuit is other current conversion of the last side A of power cable ground wire level to become other electric current of secondary side mA level, and converts voltage signal to by discharge circuit or pull-up resistor.Native system is selected HCT215 Verification of Measuring Current Transformer, and this mutual inductor nominal operation frequency is 50Hz, and rated transformation ratio is 5A/5mA, precision <0.2%, and nonlinearity <0.1%, phase differential was at 5～10 minutes.According to pertinent literature, when cable normally moves, ground wire electric current is generally in 2A left and right.Therefore, 200 Ω resistance are selected in native system secondary load, and now current transformer linear measurement range is 0～5A.Pull-up resistor is less, and mutual inductor precision is higher, and the range of linearity is larger, so this value can be adjusted according to site specific.
Be noted that, the voltage signal of current transformer circuit output is sine wave signal, not only contain fundametal compoment, also contain various high-frequency harmonic components, can not directly access single-chip microcomputer, and need to pass through modulate circuit, utilize low-pass filter circuit to remove higher hamonic wave, and by absolute value circuit, AC signal is transformed to direct current signal, to be applicable to the requirement of single-chip I/O mouth level.
An active Butterworth LPF circuit of quadravalence of the present embodiment design, circuit cut-off frequecy of passband ω c=100 л rad/s, stopband carries only frequencies omega s=200 л rad/s, passband allows maximum loss Amax=3dB, stopband allows minimal losses Amin=10dB, by the fertile filtering circuit cascade of two second order Barts, forms, and can filtering surpasses the higher harmonic components of power frequency, and power frequency component is amplified to 2 times, and circuit theory diagrams as shown in Figure 2.
After filtering with amplify after voltage signal be AC signal, can not meet the needs that the effective input voltage of Chip Microcomputer A/D converter is direct current signal, therefore still must process by absolute value circuit, convert alternating voltage to DC voltage, circuit as shown in Figure 3.
The present embodiment slave computer adopts 8 COMS FLASH single-chip microcomputer PIC16F877A of Microchip company, and this single-chip microcomputer is the most complete model of function in PIC16F87XA series, has abundant pin function.This chip has 10 A/D converters of 8 passages, and universal synchronous/asynchronous serial communication (USART) module with 3 timers and the detection of 9 bit address, meets native system data sampling and communicating requirement.PIC16F877A or a low-power consumption process chip, operating voltage is 2V～5.5V, in 5V voltage, 4MHz crystal oscillator situation, exemplary operation electric current is less than 2mA.
Conventional single-chip microcomputer human-computer interaction interface generally adopts light emitting diode, LED charactron and liquid crystal display, the present embodiment need to show current current effective value, diode and charactron cannot meet the demands, and therefore adopt 1602 common in actual applications LCD MODULE.This module is a kind of for showing the lattice type LCD of numeral, letter and symbol, and the capacity of display is 16*2 character, and module optimum operating voltage is 5V, and 16 pins are with backlight function, and inside modules controller has 11 steering orders.
It is worth mentioning that, the module of power carrier described in the present embodiment is to adopt BWP09 power carrier module, this module is a low cost, high performance power carrier module, this module integration carrier wave transmission and reception circuit, only must external inductive coupler, just can form power line carrier, PLC application system.Module working power is 5V and 16V, and carrier frequency is 60kHz, and interface mode is Transistor-Transistor Logic level serial line interface, and carrier wave speed is 300bps, and serial ports speed is 9600bps, and modulation system is FSK and DSSS.While being connected with PIC16F877A, the cross connection of data pin TX, RX palpus, while using serial ports to be connected with host computer, need to be used the change-over circuit of Transistor-Transistor Logic level and RS232 level.
Inductive coupler utilizes electromagnetic induction principle, and high-frequency carrier signal is coupled to cable shield, realizes the remote transmission of carrier signal.Inductive coupler is divided into pouring-in and plug-in, it is little that injection inductive coupler has signal attenuation, the advantages such as long transmission distance, but must have a power failure, install, it is simple and convenient that clamping-type inductive coupler has installation, the advantage that need not have a power failure, but compare injection inductive coupler, there is signal attenuation larger, the inferior position such as transmission range is nearer.Native system adopts the pouring-in power plant of SL-Y2 type coupling mechanism, during installation, coupling mechanism primary side is connected in series into power cable ground wire, and secondary side is connected with power line carrier, PLC module by high frequency cable.
The foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (4)
1. an on-line monitoring system for the power cable ground line current based on screen layer carrier communication, is characterized in that: comprise a current transformer, the first inductive coupler and the second inductive coupler; This current transformer gathers tested near-end cable grounding line capacitance electric current and gives a slave computer extraction current effective value through a current regulating circuit; Described slave computer is connected with LCD display module and first carrier module; Described first carrier module is connected with described tested near-end cable through the first high flat cable, the first inductive coupler; The signal that described the second inductive coupler extracts power cable end is connected with a host computer through the second high frequency cable, the second carrier module and serial port circuit successively.
2. the on-line monitoring system of the power cable ground line current based on screen layer carrier communication according to claim 1, is characterized in that: the model of described current transformer is HCT215.
3. the on-line monitoring system of the power cable ground line current based on screen layer carrier communication according to claim 1, is characterized in that: described current regulating circuit comprises the active Butterworth LPF circuit of quadravalence and the absolute value circuit connecting successively.
4. the on-line monitoring system of the power cable ground line current based on screen layer carrier communication according to claim 1, is characterized in that: first and second described power carrier module is BWP09 power carrier module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658028.5U CN203502479U (en) | 2013-10-24 | 2013-10-24 | Shielding layer carrier communication-based power cable ground wire current on-line monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320658028.5U CN203502479U (en) | 2013-10-24 | 2013-10-24 | Shielding layer carrier communication-based power cable ground wire current on-line monitoring system |
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| CN203502479U true CN203502479U (en) | 2014-03-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926449A (en) * | 2014-04-24 | 2014-07-16 | 江苏省电力公司常州供电公司 | Self-adaptive monitoring method for power cable grounding current |
| CN110048744A (en) * | 2018-01-16 | 2019-07-23 | 北京航天长征飞行器研究所 | A kind of power supply adaptor of power wire broadband carrier communication |
| CN111830314A (en) * | 2020-07-11 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Power frequency voltage detection circuit based on medium-voltage carrier coupler |
| CN112368946A (en) * | 2018-07-27 | 2021-02-12 | 住友电气工业株式会社 | Communication system and communication device |
| CN113325227A (en) * | 2021-05-31 | 2021-08-31 | 广东电网有限责任公司 | One-point grounding current acquisition method and device based on power line carrier communication |
-
2013
- 2013-10-24 CN CN201320658028.5U patent/CN203502479U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926449A (en) * | 2014-04-24 | 2014-07-16 | 江苏省电力公司常州供电公司 | Self-adaptive monitoring method for power cable grounding current |
| CN103926449B (en) * | 2014-04-24 | 2016-11-02 | 江苏省电力公司常州供电公司 | The self-adaptive monitoring method of power cable earth current |
| CN110048744A (en) * | 2018-01-16 | 2019-07-23 | 北京航天长征飞行器研究所 | A kind of power supply adaptor of power wire broadband carrier communication |
| CN112368946A (en) * | 2018-07-27 | 2021-02-12 | 住友电气工业株式会社 | Communication system and communication device |
| CN111830314A (en) * | 2020-07-11 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Power frequency voltage detection circuit based on medium-voltage carrier coupler |
| CN113325227A (en) * | 2021-05-31 | 2021-08-31 | 广东电网有限责任公司 | One-point grounding current acquisition method and device based on power line carrier communication |
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